衝撃力による鋼材内のき裂成長開始

概要

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Impact tensile experiments were carried out for cracked steel specimens at -196℃, to make clear the critical condition for the growth of a crack. when impact tension was imposed on a specimen superposed on a static tension σ_s, impact stress σ_d did not depend on σ_s in the lower range of σ_s but decrease in the higher range of σ_s with increase of σ_s for the fracture. The similar relation between σ_s and σ_<cd> was smaller for shorter specimen than that of longer one. According to the investigation on the fracture surface by SEM after impact or static experiment twin was not always observed. Studies on the distribution of dislocations by TEM, and on lattice distortion by X-ray diffraction method, near a crack tip after fracture shoed the presence of more complicated and larger microscopic distortion in the case of impact fracture.
社団法人日本機械学会の論文
1986-01-25